We present results from infrared imaging of comet LINEAR
C/1999 S4 on June 17 - 19, 2000 (pre-breakup), using the
near-IR camera NSFCAM and the mid-IR camera MIRLIN at the 3m
NASA/IRTF. Images and multi-wavelength spectroscopy were
obtained in the zJHK'L'MNQ bands, and were used to create a
1.0 - 25 \mum SED of the comet's dust and nucleus. The
coma's contribution at each wavelength was modeled using
spatial fitting (Fernandez 1999, PhD thesis; Lisse et al.
1999, Icarus 140, 189). The resulting comatic and
nuclear SEDs were then modeled using modified Mie theory
(Lisse et al. 1998, ApJ 496, 971) and the standard
nuclear thermal models (Lebofsky and Spencer 1989, Asteroids
II, 128), respectively. We report the resulting dust PSD,
mass loss rate, and albedo, as well as the nuclear radius,
and we compare these results to those obtained by others
from optical data both before and after the comet's breakup
in late July 2000.